1. Field of the Invention
The present invention relates to a printer that performs recording on a sheet material, in particular, a mechanism for temporarily stocking a sheet material that has undergone recording. The sheet materials to which the present invention is applicable include, apart from an ordinary sheet material such as a paper sheet which allows recording on one side or both sides thereof, a sheet material having a thermal activation adhesive surface which develops an adhesion property by being heated on the back side of the recording surface (printing surface), and a sheet material having on the back side of the recording surface an adhesive surface with a release sheet (liner) attached thereto.
2. Description of the Related Art
Conventionally, as disclosed in JP 2003-316265 A, there has been available an apparatus which, after recording on a sheet material serving as a recording material, temporarily stocks the sheet material for the purpose of cutting the sheet material in a predetermined length.
The apparatus disclosed in JP 2003-316265 A is a printer applicable to a sheet material having a recording surface on which recording, such as printing, is effected, and a thermal activation surface which develops an adhesion property by being heated on the back side of the recording surface.
This printer is equipped with a printing apparatus, a cutter device, and a thermal activation apparatus. The printing apparatus has a printing means for performing printing on a recording surface of a sheet material, and a first conveying means for conveying the sheet material in a predetermined direction. The cutter device is provided on the output side of the printing apparatus, and the thermal activation apparatus is provided on the output side of the cutter device. The thermal activation apparatus has a heating means for heating the side of the sheet material reverse to the recording surface, and a second conveying means for conveying the sheet material in a predetermined direction. Between the cutter device and the thermal activation apparatus, there is provided a space portion capable of deflecting the sheet by a predetermined length.
In this printer, constructed as described above, printing is performed on the recording surface of the sheet material while conveying the sheet material by the first conveying means, and then the thermal activation adhesive surface on the side of the sheet material reverse to the recording surface is heated while conveying the sheet material by the second conveying means.
In this process, the conveying speed of the second conveying means is set higher than the conveying speed of the first conveying means, whereby the sheet material is deflected in the space portion between the cutter device and the thermal activation apparatus. When the sheet material has been deflected by a predetermined length, the operation of the printing means and the first conveying means is stopped while continuing the operation of the heating means and the second conveying means, and the sheet material is cut by the cutter device.
While in the apparatus disclosed in JP 2003-316265A the sheet material is temporarily stocked by deflecting it into a U-shape, there is another known method according to which the sheet material is stocked by deflecting it into a bellows-like fashion.
As another conventional apparatus equipped with a mechanism for temporarily stocking a recording sheet, there exists a printer as disclosed in JP 2001-261228A. In the printer as disclosed in the above-mentioned publication, when the leading end of the sheet material undergoing printing sticks out of the discharge port of the apparatus casing, the sheet material is pulled or pressurized to cause recording drift, jamming, etc. before the completion of the recording or sheet cutting operation. To prevent such an inconvenience, the sheet material is stocked inside the apparatus until the recording and sheet cutting operations have been completed, the sheet material being discharged to the exterior of the apparatus through a discharge port after the completion of these operations.
This apparatus is equipped with a space in which the sheet that has undergone recording is kept dangling by its own weight while held by a driving roller and a driven roller. The sheet that has undergone recording is temporarily stocked in this space, and when the recording and sheet cutting have been completed, the driving roller is driven in a reverse rotation to switch the sheet conveying direction, and the sheet that has undergone recording and cutting is discharged to the exterior of the apparatus through the discharge port.
The mechanism for temporarily stocking the recording material as disclosed in JP 2003-316265A and JP 2001-261228A adopts a system in which the sheet material that has undergone recording is deflected into a U-shape or in a bellows-like fashion or kept dangling in a predetermined space until a predetermined processing, such as recording or sheet cutting, has been completed.
Thus, the mechanism has a problem in that the larger the length of one sheet required during the process from recording the sheet material to the cutting thereof, the larger the space that must be prepared for the stocking of the sheet material. In other words, depending on the size of the sheet material stocking space, the length of one sheet allowing recording is restricted.
Further, when the size of the space for stocking the sheet material is increased, the size of the apparatus main body becomes rather large. Thus, the temporary stocking mechanism as disclosed in JP 2003-316265 A and JP 2001-261228 A cannot be applied to a small-size mobile printer that can be easily carried about with one hand.
In view of the above problem in the prior art, it is an object of the present invention to provide a temporary stocking mechanism for a sheet-like recording material providing a large stocking capacity with a small space, and a printer equipped with such a temporary stocking mechanism.
To achieve the above object, in accordance with the present invention, there is provided a temporary stocking mechanism for a recording material which temporarily stocks a sheet-like recording material before executing a predetermined processing thereon, characterized by including a take-up device which takes up the sheet-like recording material on a roller for the purpose of stocking it. The present invention also covers a printer equipped with such a temporary stocking mechanism.
In the above construction, when temporarily stocking the sheet-like recording material, the sheet-like recording material is stocked in a state in which it has been taken up on the roller. Thus, unlike the conventional construction in which the sheet-like recording material is stocked while deflected into a U-shape or in a bellows-like fashion or kept dangling, this construction does not require the preparation of a large stocking space. In other words, it is possible to stock a relatively long recording material in a small stocking space.
As described above, according to the present invention, the sheet-like recording material is stocked in a state in which it has been taken up on the roller, so that there is no need to prepare a large space for stocking the sheet-like recording material, thereby achieving a reduction in apparatus size. Further, since the sheet-like recording material is wound around the roller, the sheet length allowing stocking is less restricted.
Further, the temporary stocking mechanism of the present invention provides a large stocking capacity with a small space, so that it is also applicable to a small-size mobile printer.
In the accompanying drawings:
An embodiment of the present invention will now be described with reference to the drawings.
The thermal printer as shown in
The heat sensitive adhesive sheet 1 has a construction in which a heat insulating layer and a heat sensitive coloring layer (layer allowing printing; hereinafter also referred to as the “printable layer”) are formed, for example, on the obverse side of a sheet base material, and in which a heat sensitive adhesive agent is applied to and dried on the reverse side of the sheet material to form a heat sensitive adhesive agent layer. The heat sensitive adhesive agent layer consists of a heat sensitive adhesive agent whose main component is a thermoplastic resin, a solid plastic resin, or the like. Further, the heat sensitive adhesive sheet 1 may also be one having no heat insulating layer or one having on the surface of the heat sensitive layer a protective layer or a colored printed layer (a layer that has previously undergone printing).
The printing thermal head 4 of the printing unit has a plurality of heat generating elements consisting of a plurality of relatively small resistors arranged in the width direction so as to allow dot printing. The printing unit is equipped with a printing platen roller 5 held in press contact with the printing thermal head 4.
Further, the above printing unit is equipped with a drive system (not shown) adapted to rotate the printing platen roller 5 and composed, for example, of a stepping motor and a gear row or the like; by rotating the printing platen roller 5 in a predetermined direction by this drive system, the heat sensitive adhesive sheet 1 attached to the roll accommodating unit 2 is pulled out of the roll, and sent out in a predetermined direction while undergoing printing by the printing thermal head 4. In
The cutter unit 3 serves to cut the heat sensitive adhesive sheet 1 that has undergone printing by the printing thermal head 4 in a predetermined length, and is composed of a movable cutting edge (not shown) operated by a drive source (not shown), such as an electric motor, a stationary cutting edge (not shown) opposed to the movable cutting edge, etc.
The take-up device 10 of the above stocking unit is equipped with the take-up roller 10a for taking up in a cylindrical fashion the heat sensitive adhesive sheet that has undergone printing and been conveyed, and a plurality of guides 10b arranged so as to surround the outer peripheral surface of the take-up roller 10a. The take-up roller 10a is controlled by using a rotary driving means, such as a motor. Further, the frictional resistance between the outer side surface of the take-up roller 10a and the heat sensitive adhesive sheet 1 is set higher than the frictional resistance between the heat sensitive adhesive sheet 1 and the guides 10b.
The guides 10b are mounted in a state in which they are urged against the outer peripheral surface of the take-up roller 10a by an elastic member. As a result, the guides 10b are held in close contact with the outer peripheral surface of the take-up roller 10a. When the pile thickness of the heat sensitive adhesive sheet 1 on the take-up roller 10a increases as the heat sensitive adhesive sheet 1 is taken up on the take-up roller 10a, the guides 10b move outwards in the radial direction of the take-up roller 10a by an amount corresponding to the thickness, thus enlarging the distance between the outer peripheral surface of the take-up roller 10a and the guides 10b.
Further, the take-up device 10 is equipped with an insertion inlet 10c for inserting the heat sensitive adhesive sheet 1 into the gap between the outer peripheral surface of the take-up roller 10a and the guides 10b. Further, immediately before the insertion inlet 10c, there are arranged a conveying roller 11 for conveying the heat sensitive adhesive sheet 1 that has undergone printing, and a driven roller 12 adapted to be driven to rotate while pressurized by the conveying roller. While retaining the heat sensitive adhesive sheet 1 conveyed through the printing unit, the conveying roller 11 and the driven roller 12 introduce the heat sensitive adhesive sheet 1 into the insertion inlet 10c of the take-up device 10 or extract it out of the insertion inlet 10c of the take-up device 10. The switching between the introduction and extraction of the heat sensitive adhesive sheet 1 is effected by switching the rotating direction of the conveying roller 11. The conveying roller 11 is in synchronism with the rotating operation and rotating direction of the take-up roller 10a.
In this embodiment, the thermal activation thermal head 6 of the thermal activation unit described above is of a construction similar to that of the printing thermal head 4, that is, it is of a construction similar to that of the printing head of a well-known thermal printer, which is formed by providing a protective layer of crystallized glass on the surface of a plurality of heat generating resistors formed on a ceramic substrate by the thin-film technique. In this way, as the thermal activation thermal head 6, one of the same construction as the printing thermal head 4 is used, whereby it is possible to use the same component for different purposes, thereby achieving a reduction in cost. It should be noted, however, that it is not necessary for the heat generating element of the thermal activation thermal head 6 to be divided in dot units as in the case of the heat generating element of the printing thermal head 4; it may be a continuous resistor.
The above thermal activation unit is equipped with a thermal activation platen roller 7 held in press contact with the thermal activation thermal head 4, and a discharge roller 8 for discharging the thermally activated heat sensitive adhesive sheet 1 to the exterior of the apparatus casing.
Further, the thermal activation unit is equipped with a drive system adapted to rotate the thermal activation platen roller 7 and composed, for example, of a stepping motor and a gear row or the like; by this drive system, the thermal activation platen roller 7 is rotated clockwise, and the heat sensitive adhesive sheet 1 is conveyed upwards as seen in the drawing. Further, the thermal activation unit is equipped with a pressurizing means (e.g., a coil spring or a plate spring) for pressing the thermal activation platen roller 7 against the thermal activation thermal head 6. In this regard, by keeping the axial direction of the rotation shaft of the thermal activation platen roller 7 and the heat generating element arranging direction in the thermal activation thermal head 6 parallel to each other, it is possible to effect press contact uniformly over the entire range in the width direction of the heat sensitive adhesive sheet 1.
Next, the operation of the thermal printer of this embodiment will be described with reference to
First, the heat sensitive adhesive sheet 1 wound into a roll is attached to the roll accommodating unit 2. When, thereafter, the heat sensitive adhesive sheet 1 is conveyed to the printing unit, the printing platen roller 5 rotates, and printing control of the printing thermal head 4 is started. As shown in
Then, the heat sensitive adhesive sheet 1 is delivered from the printing unit through rotation of the printing platen roller 5, and conveyed to the cutter unit 3 constituting the next stage.
After it has passed the cutter unit 3, the leading end of the heat sensitive adhesive sheet 1 is directed toward the stocking unit by the conveying direction switching means 13, and is caught between the conveying roller 11 and the driven roller 12 being rotated.
As shown in
As it moves forward, the heat sensitive adhesive sheet 1 inserted into the insertion inlet 10c is gradually taken up on the take-up roller 10a of the take-up device 10. At this time, the guides 10b press the heat sensitive adhesive sheet 1 against the outer peripheral surface of the take-up roller 10a by the urging force of the elastic member, so that the heat sensitive adhesive sheet can be reliably wound around the take-up roller 10. As shown in
When, thereafter, the printing operation by the printing thermal head 4 is completed, the rotating operation of the printing platen roller 5 and the conveying roller 11 is stopped, and the heat sensitive adhesive sheet 1 is cut at a desired position by the cutter unit 3.
After the cutting, the rotating operation of the conveying roller 11 is started again as shown in
Thereafter, as shown in
When the heat sensitive adhesive sheet 1 temporarily stocked in the take-up device 10 of the stocking unit is conveyed to the thermal activation unit, the thermal activation platen roller 7 rotates clockwise, and heating control of the thermal activation thermal head 6 is started. At this time, the rotation control of the printing platen roller 5 remains interrupted.
The heat sensitive adhesive sheet 1 delivered from the take-up device 10 is caught between the thermal activation platen roller 7 and the thermal activation thermal head 6, and as it is conveyed through rotation of the thermal activation platen roller 7 and the conveying roller 11, the heat sensitive adhesive agent layer is heated by the thermal activation thermal head 6. At the time when this heating process is completed, the heat sensitive adhesive sheet 1 temporarily stocked in the take-up device 10 has been entirely pulled out, so that, as shown in
The heat sensitive adhesive sheet 1 of a predetermined length, which has undergone printing, cutting, and heating as described above, is discharged to the exterior of the apparatus through rotation of the discharge roller 8, and is attached as it is to a cardboard, a food wrapper, a glass bottle, a plastic container, etc. as an indicator label.
As described above in relation to the printer operation, the thermal printer of this embodiment adopts the take-up roller 10a as the mechanism for temporarily stocking the heat sensitive adhesive sheet 1 that has undergone printing prior to executing cutting and thermal activation processing, so that it is possible to stock the heat sensitive adhesive sheet 1 in a state in which it has been taken up in a cylindrical form. Thus, there is no need to prepare a large space for the stocking of the heat sensitive adhesive sheet 1, thereby making it possible to achieve a reduction in apparatus size. Further, due to the construction in which the heat sensitive adhesive sheet 1 is taken up on the take-up roller 10a, it is possible to provide a large stocking capacity with a small stocking space, so that the sheet length allowing stocking is less restricted.
The printer of the present invention is not restricted to the embodiment specifically described above, but allows various modifications without departing from the gist of the invention.
For example, while in the above-described embodiment a heat sensitive type printing device like a thermal printer is applied as the printing unit, the present invention is also applicable to printing devices of the thermal transfer system, the ink jet system, the laser printing system, etc. In this case, instead of the heat sensitive printing layer, a sheet material which has undergone a processing suitable for the printing system adopted is used as the printable layer of the sheet material.
Further, the mechanism for temporarily stocking a sheet-like recording material of the present invention, which is of the apparatus construction as shown in
Number | Date | Country | Kind |
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2004-271265 | Sep 2004 | JP | national |
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4962386 | Hakkaku et al. | Oct 1990 | A |
20030189631 | Hoshino et al. | Oct 2003 | A1 |
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4417770 | Nov 1995 | DE |
00063022 | Feb 2000 | JP |
2000296630 | Oct 2000 | JP |
2004216732 | Aug 2004 | JP |
Number | Date | Country | |
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20060062627 A1 | Mar 2006 | US |